Hi,
I have a problem with Android 3.2. The following line causes the
NullPointer exception under Android 3.2:
btnAbout.setOnClickListener(aboutSelected);
In the debugger I can see that aboutSelected is NOT null. The same
code runs without problems under Android 4.0.3 and 2.3.3.
Does anybody knows how to solve that problem ?
Thanks
Andre
Code:
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
GridView gridView = (GridView) findViewById(R.id.hersteller);
gridView.setAdapter(new ImageAdapter(this));
gridView.setOnItemClickListener(herstellerSelected);
Button btnSuchen = (Button) findViewById(R.id.btnSuche);
btnSuchen.setOnClickListener(sucheSelected);
Button btnAbout = (Button) findViewById(R.id.btnAbout);
btnAbout.setOnClickListener(aboutSelected);
// Button btnKonfiguration = (Button)
findViewById(R.id.btnKonfiguration);
// btnKonfiguration.setOnClickListener(konfigurationSelected);
SQLiteDatabase.loadLibs(this);
dbAdapter myDbAdapter = new dbAdapter(this);
boolean dbExist = myDbAdapter.checkDatabase();
if (!dbExist) try {
myDbAdapter.createDatabase();
}
catch (IOException e) {
throw new Error ("Datenbank kann nicht kopiert werden");
}
myDbAdapter.close();
SharedPreferences einstellungen =
PreferenceActivity.getEinstellungen(this);
String land = einstellungen.getString("ListLand", "");
if (land.equals("")) {
land = getString(R.string.Deutschland);
SharedPreferences.Editor editor = einstellungen.edit();
editor.putString("ListLand", land);
editor.commit();
}
if (isOnline()) {
//
} else {
// Keine Internetverbindung => Warnmeldung anzeigen !
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage(getString(R.string.KeineInternetverbindung));
builder.setCancelable(false);
builder.setPositiveButton(getString(R.string.Ok), new
DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int
which) {
dialog.cancel();
}
});
AlertDialog alert = builder.create();
alert.show();
}
}
Trace:
05-08 06:35:47.770: E/AndroidRuntime(572): FATAL EXCEPTION: main
05-08 06:35:47.770: E/AndroidRuntime(572): java.lang.RuntimeException:
Unable to start activity ComponentInfo{com.wiget.autokatalog/
com.wiget.autokatalog.AutokatalogActivity}:
java.lang.NullPointerException
05-08 06:35:47.770: E/AndroidRuntime(572): at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:
1815)
05-08 06:35:47.770: E/AndroidRuntime(572): at
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:
1831)
05-08 06:35:47.770: E/AndroidRuntime(572): at
android.app.ActivityThread.access$500(ActivityThread.java:122)
05-08 06:35:47.770: E/AndroidRuntime(572): at
android.app.ActivityThread$H.handleMessage(ActivityThread.java:1024)
05-08 06:35:47.770: E/AndroidRuntime(572): at
android.os.Handler.dispatchMessage(Handler.java:99)
05-08 06:35:47.770: E/AndroidRuntime(572): at
android.os.Looper.loop(Looper.java:132)
05-08 06:35:47.770: E/AndroidRuntime(572): at
android.app.ActivityThread.main(ActivityThread.java:4123)
05-08 06:35:47.770: E/AndroidRuntime(572): at
java.lang.reflect.Method.invokeNative(Native Method)
05-08 06:35:47.770: E/AndroidRuntime(572): at
java.lang.reflect.Method.invoke(Method.java:491)
05-08 06:35:47.770: E/AndroidRuntime(572): at
com.android.internal.os.ZygoteInit
$MethodAndArgsCaller.run(ZygoteInit.java:841)
05-08 06:35:47.770: E/AndroidRuntime(572): at
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
05-08 06:35:47.770: E/AndroidRuntime(572): at
dalvik.system.NativeStart.main(Native Method)
05-08 06:35:47.770: E/AndroidRuntime(572): Caused by:
java.lang.NullPointerException
05-08 06:35:47.770: E/AndroidRuntime(572): at
com.wiget.autokatalog.AutokatalogActivity.onCreate(AutokatalogActivity.java:
47)
05-08 06:35:47.770: E/AndroidRuntime(572): at
android.app.Activity.performCreate(Activity.java:4397)
05-08 06:35:47.770: E/AndroidRuntime(572): at
android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:
1048)
05-08 06:35:47.770: E/AndroidRuntime(572): at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:
1779)
05-08 06:35:47.770: E/AndroidRuntime(572): ... 11 more
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